Výsledky vyhledávání - "Jan G. H. du Preez"

NITROGEN REAGENTS IN METAL ION SEPARATION. XI. THE SYNTHESIS AND EXTRACTION BEHAVIOR OF A NEW NS IMIDAZOLE DERIVATIVE

Autor: Jan G. H. du Preez, Bernardus J.A.M. van Brecht, Thomas I. A. Gerber, Wendy Edge, Victor L. V. Mtotywa

Publikováno v: Solvent Extraction and Ion Exchange. 19:143-154

A new extractant with an NS donor chromophore viz. 2-(1-ethylthiomethyl)-1-decyl imidazole (ETDIMZ) has been synthesized. Its extraction behavior towards each of Co2+, Ni2+, Cu2+, and Zn2+ in each of perchlorate, chloride and thiocyanate media in dil

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3679535f97c3dbf7792b3733dec5143d
https://doi.org/10.1081/sei-100001379

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RECENT ADVANCES IN AMINES AS SEPARATING AGENTS FOR METAL IONS

Autor: Jan G. H. du Preez

Publikováno v: Solvent Extraction and Ion Exchange. 18:679-701

In this article those aspects of the application of amines in metal ion separation during the last two decades which could be regarded as new facets or as clarifying earlier concepts have been briefly dealt with. This includes work with diammonium ex

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1c960daba04bdd470b46d7f43a66ed59
https://doi.org/10.1080/07366290008934703

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The reactivity of the [Re≡O]3+ core toward aromatic 1,2-diamines: the formation of rhenium(V)-imido complexes

Autor: Thomas I. A. Gerber, Joanne Perils, Giuliano Bandoli, Jan G. H. du Preez

Publikováno v: Inorganica Chimica Acta. 278:96-100

The reaction of the aromatic diamines 1,2-diaminobenzene, 2,3-diaminophenol (H 2 L), 2,3-diaminotoluene and 3,4-diaminobenzophenone (H 2 NRNH 2 ) with trans -ReOCl 3 (PPh 3 ) 2 in an equimolar ration in ethanol gave the products trans -[Re(N

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::385ecd9f0a868544f3f8500a5c69a742
https://doi.org/10.1016/s0020-1693(97)06164-1

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NITROGEN REAGENTS IN METAL ION SEPARATION. PART IX. EXTRACTION OF COBALT AND NICKEL USING IMIDAZOLE DERIVATIVES

Autor: Wendy Edge, Bernard J. van Brecht, Carmen Potgieter, Jan G. H. du Preez, Nicole Sumter, Charlene Mattheüs

Publikováno v: Solvent Extraction and Ion Exchange. 16:1033-1046

The extraction capability of derivatives of imidazole towards Co(II) and Ni(II) has been investigated in dilute acid medium in the presence of each of chloride, perchlorate and thiocyanate ions. The influence of the stereochemistry of the substituted

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::20897221fdc5afa92f551a2dc563407e
https://doi.org/10.1080/07366299808934567

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The coordination mode of 3-hydroxypicolinic acid in oxorhenium (V) complexes. Crystal and molecular structures of (n-Bu4N) [ReOCl3 (HOC5H3NCO2)] and [ReOCl(HOC5H5NCO2)2]

Autor: Jan G. H. du Preez, Giuliano Bandoli, Stefano Gatto, Joanne Perils, Thomas I. A. Gerber

Publikováno v: Inorganica Chimica Acta. 269:235-240

The reaction of (n-Bu4N)[ReOCl4] with 3-hydroxypicolinic acid (HL1) in benzene and ethanol yields the green (n-Bu4N) [ReOCl3 (L1)] (1) and blue [ReOCl(L1)2] (2) complexes, respectively. Elemental analysis, infrared. 1H NMR and conductivity results in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::907ac4d65d12d84d356ab157e3d96027
https://doi.org/10.1016/s0020-1693(97)05800-3

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NITROGEN REAGENTS IN METAL ION SEPARATION. PART VIII SUBSTITUTED IMIDAZOLES AS EXTRACTANTS FOR Cu3+

Autor: Nicole Sumter, Charlene Mattheüs, Swarnum Ravindran, Carmen Potgieter, Bernard J. van Brecht, Jan G. H. du Preez

Publikováno v: Solvent Extraction and Ion Exchange. 16:565-586

A number of derivatives of imidazole have been synthesized. Their extraction behaviour towards Cu2+ in dilute acid medium have been investigated in both chloride and perchlorate media. The influence of electronic and stereochemical effects are discus

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0802598d1855e990f96708a9c23f85a3
https://doi.org/10.1080/07366299808934540

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NITROGEN REAGENTS IN METAL ION SEPARATION. PART VII. THE DEVELOPMENT OF A NOVEL COPPER(II) EXTRACT ANT

Autor: Jan G. H. du Preez, Nicole Sumter, Bernard J. van Brecht, Swarnum Ravindran, Charlene Mattheils

Publikováno v: Solvent Extraction and Ion Exchange. 15:1007-1021

It is illustrated how basic chemistry knowledge can be applied to develop a novel separating agent for copper(II) in the form of 1-decylimidazole. Its high extraction efficiency for Cu2+ in an acidic dilute chloride medium was illustrated. A comparat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3dc48873bb1d0dc594564bf0c2ef5c84
https://doi.org/10.1080/07366299708934518

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Diamine and Diammonium Extractants

Autor: Jan G. H. Du Preez

Publikováno v: Mineral Processing and Extractive Metallurgy Review. 15:153-161

The application of di-tertiary amines and di-quaternary ammonium salts as extractants for metal ion separation is discussed. The versatility of the di-tertiary amines is illustrated. In these cases, two extraction mechanisms are postulated to coincid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::085eba0680dc71f8b2e761831b3dcd0b
https://doi.org/10.1080/08827509508914193

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